Oh please, it was exactly like the Jamaicans today. All the fastest runners in the world coming from one little track club (Santa Monica TC). All of them having braces despite good teeth beforehand - classic sign of Human growth hormone. Trading world records between Carl Lewis and Leroy Burrell. At the time I remember hearing from the olympic 4x100m medalist in my track club that Carl had grown an inch or two. None of this is conclusive but a bit of bayesian math gets you pretty close to a definitive conclusion. Let's go through the math:
Lets start withba conservative assumption about then Prior odds carl did serious drugs: 25pct
Odds carl's whole track team would get braces as adults, if they WERE taking HGH: 75pct
Odds they all get braces but not cheating: 10pct
Therefore Posterior prob carl did serious drugs: 71pct
Now we add the next layer.
Odds multiple world record holders in 100m at same track club at same time, given drug use: 30pct
Odds multiple record holders at same club at same time given no drug use: 5pct
Therefore posterior prob that carl did serious drugs: 94pct
We could add his unusual longevity, his late-career improvement, evidence of "lesser" cheating, etc to arrive at a truly damning 99pct plus probability...